Albeet ball



I ,A. BALL. Machin for Grinding Spindles.

No. 228,590. Patented June 8,1880.-

NAFE ERS, PNOTO-LITHOGRAPHER, WASHINGTON. 0. c.

UNITED STATES PATENT OFFICE.

ALBERT BALL, OF GLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINE COMPANY, OF SAME PLACE.

' MACHINE FOR GRINDING SPIINDLES.

SPECIFICATION forming part of Letters Patent No. 228,590, dated June 8, 1880.

Application filed June 20, 1878.

To all whom it may concern Be it known that I, ALBERT BALL, of Claremont, in the county of Sullivan and State of New Hampshire, have invented a new and useful Improvement in Machines for Grinding Spindles; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

In applying the Essex cop-tubes it has been found that the spindles vary in their dimensions and outlines, and, to insure the successful operation of the tubes, have to be reduced to a uniform shape and size. The object, there fore, I have in. view is to produce a machine which-will do this in a simple and efficient manner.

My invention therein consists in adjustable blocks for steadying the former, and in the various operative combinations of the principal parts, all as fully hereinafter explained.

In the drawings, Figure 1 is a top view of the improvement, with the position of the 2 5 grinding-wheel indicated in dotted lines; Fig.

2, an end view of the same, Fig. 3, a crosssection on the line 3 3 in Fig. 1; Fig.4, aperspective view of the sliding plates of the centering-rest, and Fig. 5 a section of the rest with 0 these plates in position.

Like letters denote corresponding parts.

A is the bed of the machine, having longitudinal ways a a, upon which slides the plate B. The ways a a are preferably constructed 3 5 as shown, one being a fiat plain guiding surface, while the other is of angular form.

The plate B is moved back and forth upon the bed, as desired, by a screw, 0, journaled centrally in one end of the bed and turning 40 in a threaded nut on the end of the plate. This screw has a hand-wheel, b, on its outer end, by which it may be operated. Upon this plate is mounted a frame, D, moving on ways 0 c, placed at right angles 'to the ways a a,

and, like them, constructed with one angular and one plain guiding-surface.

The frame'D is kept in a forward position by crank-arms d and links cl, such arms being keyed to the ends of a spring-shaft, D, journaled longitudinally on the under side of the plate 13. A spiral spring, d is coiled around this shaft, and is secured to the plate and the shaft, so as to turn the shaft forward, the links d being connected to the frame D, giving it a motion in the same direction upon the plate B.

The frame D, on its front side, is provided with two centers, E E, for holding the spin dles to be ground. The centerE is adjustable in one end of the frame, and is held fast at anypoint by a set-screw. The center E is mounted in a block, E adjustable by means of screws and slots upon the frame D, and is forced forward by a spring, a, secured to the head 0 of the center and to the block E The spindle to be ground (shown by the letter F) is placed in these centers after they have been properly adjusted by springing back the cen- I ter E. This spring-center serves the double purpose of keeping the centers in contact with the ends of the spindle and of allowing the j spindle to expand when heated in grinding.

A rest, G, projects from the frame D under the spindle, just to one side of the pulley fon the same. This rest has three bearing-plates, g g with inclined outer sides, which slide in beveled dovetail grooves in the rest G. The plate 9 has a plate, 9 secured rigidly to it and loosely to the plates g 1 A thumbscrew, h, turns in the rest G and through the extended end of the plate 9 and by turning this screw it all these plates 9 g y will be together adjusted in the rest G, farther away from or nearer to a central line. The rest Gr serves to-support and steady the spindle and 8 keep it running true in the operation of grinding. By the devices just described the hearing in the rest can be brought very quickly and without error to the size of any spindle.

Back rests, G, are adj ustably secured to the frame D behind the spindle, and can be set against the spindle to prevent it from vibrating in grinding.

In the opening h in the frame D, back of the spindle to be ground but parallel thereto, is removably held a former, H, which is of the exact shapeto which it is desired to grind the spindles. A spindle of the right form can be cut off and used for this former. It is held at its small end in an adjustable center, i, like the center E, and at the other end by set-screws i, which are capable of being adjusted so as to set the former parallel to the spindle to be ground.

The former H is supported and steadied from the rear by blocks H, adjusted by setscrews j and held down by a leaf-spring, j. These blocks prevent the former from being forced out of line by the pressure of the springshaft D.

The tracer-arm I, the angular forward end I of which projects up into the opening it in front of the former, slides in the horizontal arm is of a stand, K, which is rigidly attached to the side of the bed A. This stand K projects up against the side of the plate B, and its horizontal arm 70, situated at right angles to the body of the stand, extends across the top of the plate B, under the edge of the frame D, and into the opening it, where its forward end, It, is bent up the same as the end I of the tracer-arm. The outer end of the tracerarm 1 is extended through the standard, and is screw-threaded to receive a thumb-nut, 1 which is held in place by a spring-strap, Z, secured to the stand beneath the thumb-nut, with its end in a groove in the hub of the same. This spring-strap holds the nut up against the end of the stand and prevents it from moving back, and also retains it in the same position till moved by the thumb and fingers, preventin git from being turned around by any jar which the parts may receive inuse. The pressure of the springshaft keeps the former against the upwardly-turned end I of the tracer-arm.

It will be seen that when the plate 13 is moved back and forth upon the bed by the screw 0, the former will be always in close contact with the tracer, and the frame D and the spindle carried by it will be moved back and forth upon the plate B in exact accordance with the shape of the former.

angle-irons of such height as to bring the center of the spindle to be ground on a level with the center of the emery-wheel arbor and parallel with it. A drum three or four inches in diameter should be. placed upon the angleirons and revolved five or six hundred times a minute, and connected with the pulley f on the spindle being ground by a band or cord, so as to turn the spindle in an opposite direction to the motion of the emery-wheel.

The spindle will in every instance be reduced by grinding to the shape of the former, and by turning the thumb-nut I the spindle will be drawn away from or moved up to the grinding-wheel, varying the size of the spindle being ground, but not changing its shape.

It is evident that the former could be made round or fiat, or of any shape, so long as the side which moves in contact with the tracer is of the outline desired to be given the spindles. The former can also be made of the same or a different size from the final size to which the spindles are to be ground without departing from the spirit of my invention.

What I claim as my invention is 1. The combination, with the plate B and frame D, of the spring-shaft D, arms (1, and links d, substantially as described and shown.

2. The combination, with the rest G, of the plates 9 g g adjustable toward and away from a central line by the screw it, substantially as described and shown.

3. The combination, with the frame D, of the spring-center E, adjustable center E, and rest G, for holding the spindles, substantially as described and shown.

4. The adjustable blocks 11, for steadying the former, substantially as described and shown.

This specification signed and witnessed this 5th day of June, 1878.

ALBERT BALL.

Witnesses:

HERMoN HoL'r, CHARLES E. Bron. 

